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Displaying AFOS PIL: PNSFGF Product Timestamp: 2020-07-10 16:37 UTC
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174 NOUS43 KFGF 101637 PNSFGF MNZ001>009-013>017-022>024-027>032-040-110445- Public Information Statement National Weather Service Grand Forks ND 1137 AM CDT Fri Jul 10 2020 ...NWS DAMAGE SURVEY FOR 07/08/20 TORNADO EVENT... .OVERVIEW... A rapidly developing supercell thunderstorm produced a long lived and deadly tornado that originally touched down in far northern Grant County MN, as a weak tornado /EF0-EF1/, but then quickly intensified into a strong to violent tornado as it crossed into southern Otter Tail County, near MP70 on Interstate-94. The tornado intensified as a strong tornado /EF2-EF3/ as it moved northeastward through southwestern St. Olaf Township and crossed Beebe Lake. It likely reached maximum EF3 intensity after it crossed Highway 82 and as it destroyed a machine shop and yard on the downwind side. It then continued in a northeast direction and reached both maximum width and intensity as it moved into and across a rural homestead along 120th Street and into Blacken Lake. The tornado continued in a northeast direction producing mainly tree and cropland damages as it crossed CR117, north of Kvam Church. Video imagery and deep ground scour indicate that the tornado maintained its intensity as a strong to violent tornado even as it narrowed and eventually began to rope out, near 325th Avenue, between 145th street and CR12. The storm that produced this tornado continued eastward across southern Otter Tail County and may have produced one or more additional but brief tornadoes along its path. .TORNADO... Grant and Otter Tail County Southeast of Dalton MN Rating: EF-4 Estimated peak wind: 170 mph Path length /Statute/: 9 miles Path width /Maximum/: 650 yards Fatalities: 1 Injuries: 3 Start date: Jul 8 2020 Start time: 508 pm CDT Start location: 6.5 W Ashby / Grant County / MN Start Lat/Lon: 46.09525 / -95.94205 End date: Jul 8 2020 End time: 539 pm CDT End location: 5 E Dalton / Otter Tail County / MN End Lat/Lon: 46.17784 / -95.81200 SURVEY SUMMARY: Of particular note, a well built machine shop of fairly new construction and was complete swept from its foundation and destroyed downwind, with one fatality and one injury there. At one homestead, a well built two-story house was completely swept from its foundation and decimated in a widespread and distant debris field. Two injuries occurred here as a couple shelter in the basement and debris, including a vehicle, dropped into the exposed basement. EF Scale: The Enhanced Fujita Scale Classifies Tornadoes into the following categories. EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 To 200 mph EF5...Violent...>200 mph NOTE: The information in this statement is PRELIMINARY and subject to change pending final review of the events and publication in NWS Storm Data. $$ gust
173 NOUS43 KFGF 101656 CCA PNSFGF MNZ001>009-013>017-022>024-027>032-040-110445- Public Information Statement National Weather Service Grand Forks ND 1137 AM CDT Fri Jul 10 2020 ...NWS DAMAGE SURVEY FOR 07/08/20 TORNADO EVENT... .Update... Correction on injuries. .OVERVIEW... A rapidly developing supercell thunderstorm produced a long lived and deadly tornado that originally touched down in far northern Grant County MN, as a weak tornado /EF0-EF1/, but then quickly intensified into a strong to violent tornado as it crossed into southern Otter Tail County, near MP70 on Interstate-94. The tornado intensified as a strong tornado /EF2-EF3/ as it moved northeastward through southwestern St. Olaf Township and crossed Beebe Lake. It likely reached maximum EF3 intensity after it crossed Highway 82 and as it destroyed a machine shop and yard on the downwind side. It then continued in a northeast direction and reached both maximum width and intensity /EF4/ as it moved into and across a rural homestead along 120th Street and into Blacken Lake. The tornado continued in a northeast direction producing mainly tree and cropland damages as it crossed CR117, north of Kvam Church. Video imagery and deep ground scour indicate that the tornado maintained its intensity as a strong to violent tornado even as it narrowed and eventually began to rope out, near 325th Avenue, between 145th street and CR12. The storm that produced this tornado continued eastward across southern Otter Tail County and may have produced one or more additional but brief tornadoes along its path. .TORNADO... Grant and Otter Tail County Southeast of Dalton MN Rating: EF-4 Estimated peak wind: 170 mph Path length /Statute/: 9 miles Path width /Maximum/: 650 yards Fatalities: 1 Injuries: 2 Start date: Jul 8 2020 Start time: 508 pm CDT Start location: 6.5 W Ashby / Grant County / MN Start Lat/Lon: 46.09525 / -95.94205 End date: Jul 8 2020 End time: 539 pm CDT End location: 5 E Dalton / Otter Tail County / MN End Lat/Lon: 46.17784 / -95.81200 SURVEY SUMMARY: Of particular note, a well built machine shop of fairly new construction and was complete swept from its foundation and destroyed downwind, with one fatality and one injury there. At one homestead, a well built two-story house was completely swept from its foundation and decimated in a widespread and distant debris field. Two injuries occurred here as a couple shelter in the basement and debris, including a vehicle, dropped into the exposed basement. EF Scale: The Enhanced Fujita Scale Classifies Tornadoes into the following categories. EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 To 200 mph EF5...Violent...>200 mph NOTE: The information in this statement is PRELIMINARY and subject to change pending final review of the events and publication in NWS Storm Data. $$ gust